Joinchat: Stored cross-site scripting
The Joinchat WordPress plugin before 6.4.2 does not escape the message of its button block before outputting it in an HTML attribute on the front end, which could allow users with the Author role and above to perform Stored Cross-Site Scripting attacks against any visitor of the post, including administrators. Exploitation requires the victim interaction described above; merely storing the payload is not sufficient. The structured affected range is 6.3.2 to < 6.4.2.
- Component
- Joinchat
- Plugin slug
joinchat- Affected
- 6.3.2 to < 6.4.2
- Safe version
6.4.2- Published
- Oct 30, 2026
- Weakness
- Not assigned
This CVE was published Oct 30, 2026 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update to a supported release containing the confirmed fix: 6.4.2. Validate input and escape values for their final HTML, attribute or JavaScript context; review affected stored content where applicable.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Joinchat WordPress plugin before 6.4.2 does not escape the message of its button block before outputting it in an HTML attribute on the front end, which could allow users with the Author role and above to perform Stored Cross-Site Scripting attacks against any visitor of the post, including administrators.